beginning to end. even on sundays, when most journeyed home to see their families, lincoln did not. >> and this incorporates the changes we talked about. >> yes, it does, huh? >> good. >> narrator: it caused some to wonder. judge davis said mary was to blame. >> mary supposedly, according to all the evidence, had an uncontrollable temper. >> she made life very unpleasant at home, and as a result, lincoln spent as much time away from home as he could. >> we still don't know the whole story of mary todd and abraham lincoln. historians are debating now whether in fact she was bipolar. >> whatever a writer may think about mary, they have to confront the ultimate question of why the marriage lasted. i mean, they had a marriage that many people from the outside, they didn't understand. >> his wife was, in a sense, more ambitious than he was, and she really wanted to be famous and first lady, and so she urged him on.